#define buttonPin 27
#define led1 1
#define led2 26
#define led3 0

int compte = 0;
int buttonState = 0;
int buffer = 0;

void setup() {

  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);

  pinMode(buttonPin, INPUT);
}

void loop() {
  buttonState = digitalRead(buttonPin); //see the state of the button
  Serial.println(compte);

  if(buttonState == 1) // if the button is engage
    buffer = 1;
  if(buttonState == 0 && buffer == 1){ //if we relese the button (we increment only here)
    compte ++;
    buffer = 0;
  }
    
  if(compte >2) //switch between the 3 LEDs
    compte=0;

  if(compte == 0){ //Turn on and off each LED
    digitalWrite(led1, HIGH);
    digitalWrite(led3, LOW);
  }
  else if(compte == 1){
    digitalWrite(led2, HIGH);
    digitalWrite(led1, LOW);
  }
  else{
    digitalWrite(led3, HIGH);
    digitalWrite(led2, LOW);
  }
}